Transmission Parking Actuator PWM Control for Noise and Speed
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Solution Overview
Problem
Shift-by-wire transmission systems require optimization of motor operating speed and noise control to ensure vehicle reliability, safety, and user experience, particularly when controlling positions P or N, as existing systems lack efficient noise management and prompt operability.
Innovation Solution
A method involving data input about vehicle states to determine specific control modes for an actuator, adjusting Pulse Width Modulation (PWM) duty cycles based on situations such as ignition state, transmission malfunctions, or parking, to optimize motor speed and noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator is controlled at high operating speed to ensure prompt operability for safety functions, then vehicle reliability is improved, but operating noise increases
Solution Approach 1:
The patent applies dynamics by making the motor operating speed variable rather than fixed. The control unit adjusts the motor speed dynamically based on vehicle state (driving, parking, ignition on/off) to achieve prompt operability when needed while minimizing noise during normal operations. This resolves the contradiction by allowing the system to adapt its performance characteristics to different operational contexts.
Solution Approach 2:
The patent changes the operating parameters of the motor based on different vehicle states. Specifically, it sets different target operating speeds for the motor depending on whether the vehicle is driving, parking, or in other states, thereby optimizing the balance between reliability (prompt response) and noise reduction through parameter adjustment.
2Productivity
If the motor operates at high speed to provide prompt response for safety functions, then operability is improved, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts motor operating speed based on actual vehicle state and operational requirements. Instead of maintaining high speed continuously, the motor operates at elevated speeds only when prompt response is needed (driving state, safety functions), and at lower speeds during parking or normal operations, thereby reducing overall energy consumption while maintaining productivity when required.
Solution Approach 2:
The control unit changes the motor operating speed parameter according to different vehicle states. By setting appropriate speed targets for different scenarios (high speed for safety/prompt response, lower speed for parking/normal operation), the system optimizes the energy-productivity trade-off.
3Ease of operation
If the actuator operates uniformly at all times, then ease of control is improved, but noise and energy waste increase during low-demand situations
Solution Approach 1:
The patent implements dynamic control where the motor operating speed is adjusted according to vehicle state. This maintains ease of operation through automated control while reducing noise during low-demand situations such as parking or idle states by lowering the operating speed only when prompt response is not required.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances vehicle reliability by providing prompt operability during safety functions, minimizes noise during parking, and maintains uniform operating speed and noise patterns, improving motor durability and fuel efficiency.
Implementation Method 1
the transmission is configured to be operated by an actuator equipped with a motor
Implementation Method 2
controlling a Pulse Width Modulation (PWM) duty cycle required to control the actuator to different values depending on the first, second, and situations determined at a step of the b), thus driving the actuator
Data Source
AI summary
A method of controlling a parking control device of a transmission may include a) inputting data about a state of a vehicle, b) determining, based on the data input at the step a), whether a current situation is a first situation in which an actuator of the parking control device of the transmission is to be promptly controlled, a second situation in which noise is controlled to be minimized, or a third situation which is a situation other than the first and second situations, and c) controlling a Pulse Width Modulation (PWM) duty cycle required to control the actuator to different values depending on the first, second, and third situations determined at the step b), thus driving the actuator.